Excavator.



' No. 761,382. I PATENTED MAY 31, 1904. W; E,,JAGKSON.,&;A. e. ADKINS.

EXGAVATGR. APPLICATION FILED JULY 7. 1903. I0 MODEL.

Z SHEETS-SHEET 1.

T ME swims PEI-Ens coqvndrou ma. smyaromp. c,

' No."761,382. ,PATENTED MAY3I,'1904..

N0 MODEL W. I;. JACKSON &A. G. ADKINS. EXGAVATOR.

APPLICATION FILED JULY 7, 1903.

2 SHEETS-SHEET2.

Wiirw fnl enwnsQ m: NORRIS Finns co. PNOTO-LITNO" Wnsumm'on, n, c

Patented May 31, 1904.

w UNITED STATES PATENT, OFFICE.

WALTER E...JAoxson AND ARTHUR e. ADKINS, OF PORTLAND, OREGON.

ExoAvAToR.

SPEQIFICATION forming part of Letterslatent No. 7 61 ,382, datedMay, 31,1904. Application filed July 7, 1903. SerialNo. 164,586; (No modeh) Toall whom" it may concern:

Be it known that we, WALTER E. J AcKsoN and ART UR G. ADKINS, citizensof the United States, andres'idents of Portland,in the county ofMultnomah and State of Oregon, .have invented a new and usefulImprovementin Excavators, of which the following is a specification,reference being had to the accompanying drawingsas apart thereof.

' Our invention relates to a device for excavating for the foundation ofbuildings and other purposes, and has for its object to obtain anexcavating implement which is especially adapted for effective work. Tothis end our invention comprises an earth scraper and carrier havingcombined thereelevation with the draft-gear removed. Figs.

3 and' d are details" of construction which will be again referred toand fully described in the body of this specification. Fig. 5 isaperspective detail, on a larger scale, of the linkbar 70 and the partsthereon looking toward the rear end. Fig. 6 is a perspective of thefront end of our excavator, andFig. 7 is a detail of a gravel-plowshare.

Referring now to the reference-letters, th

body of the excavator is made of sheet-steel and comprises two sideplates at a. The back end of the body is closed by a curved plate 6,which scrapes up the loose material and drags the same to the place ofdischarge. A stepc is provided for the workman to stand on while theexcavator is being hauled forward to enable him to adjust the lever c,and thereby the plowshares ff. The middle parts of the two sides of thebody are united by a yoke d,which also serves as a fulcrum for theoperatinglever e, by which the plowsharesff are raised and lowered, asmentioned. The number of plowshares used may be varied as foundconvenient. As shown in the drawings, there are four of them, consistingof two end plowshares f" and two intermediate plowshares f f. Theseplowshares are so shaped as to lift the ymaterial plowed up butslightly, and to this endtheir laterally-extending portions have only avery gradual slope, as is to be seen in the end View Fig. 2.

plowshares are provided with perforated bosses ff Through the bosses fis inserted the through-rod g, by which therear ends of the plowsharesare pivotally suspended. The ends of the rod 9 extend through slots itin the sides a c and are threaded to receive nuts 91, by which to securethe rod in place at its adjustedheight. 9' (see Fig. 2)'clamp said rearends of the plowshares in place.- The rod h is preferably made 7adjustable, so as to beable to adjust the heel The two ends of the shankportion f 2 of the The set collars of the plowshares,. as may beconvenient. I

Through the bosses f of the plowsharesis inserted a brace-rod 3',serving to unite and hold the front ends of the plowshares, collars Z Z(omitted from Fig. 6, but shown in Figs. 2 and 3) being placed on suchrod for the purpose of restraining the front end of the plowsharesagainst lateral play. The ends of the bracing-'.

rod 1 enter the bosses f on the end plowshares, but do not projectbeyond the same, so as not to interfere with the lifting and lowering ofthe plowing contrivances. The front ends of the plowshares arerespectively connected with a link-bar 70 by means of forked thedraft-bar 9". 5'0 and q are secured to set-collars Z a a, provided withperforated lugs. The yoke m is suspended from a clevis n, secured to thefront end of the lever e and longitudinally movable to adjust the liftor the power of the lever c. In cooperation with this arrangement andpurpose the lever e is also provided with a series of holes 0 to allowfor the shifting of the fulcrum-point.

.Thetwo ends r of the draft-bar r are bent at an angle and forked,and-such ends are secured by bolts s, inserted through holes t, therebyrendering the draft-bar adjustable in height, as may be required.

In the practical use of our excavator a bridge is built with an inclinedapproach and a hole in the elevated platform through which to dischargethe material dragged to such hole by the scraper-back 6.

Our excavator is conveniently-hauled to and fro by a cable and engine.The haul-back cable is attached to a ring a). In cases where the groundis of a gravelly or stony nature it will be more efiective to substituteplowshares provided with prongs w, as shown in Fig. 7.

The front ends of the sides a a are provided with shoes a to prevent thesame cutting into the ground while one excavator is being hauled forwardand without which provision the action of the plows would have atendency to drag those ends down into the ground.

Having fully described our invention, what we claim is- 1. An excavator,comprising a body consisting of two sides, a scraper-back L, and adraft-gear; a series of transversely-arranged removable plowshares, theinner ends of which are hinged on a rod transversely secured on saidbody; a lever-controlled lifting device to which the front ends of suchplowshares are connectedand by which the same are raised and lowered asrequired, and means for latch.- ing the operating-lever in its adjustedposition, substantially as described.

2. Anexcavator comprising a body consisting of two sides and ascraper-back b; a yoke or support 0? secured on thesides; anoperatinglever e, adjustably fulcrumed on such yoke; a rod g, havingthreaded ends and nuts 2', thereon, adjustably secured in slots 71,provided in said sides; plowshares hinged by their inner ends on saidrods g; a brace-rod j, and set-collars on said rods 9 and j, holding theplowshares against lateral motion; a yoke m, suspended from the end ofthe lever e; a rod 70, suspended by such yoke m; a draftbar, linksconnecting the rod 70 with said draftbar and with the front ends of theplowshares,

and means for lifting the lever e, in its adjustable position,substantially as described.

3. An excavator, comprising a body consisting of two sides; ascraper-back b, and a draft-gear; a series of transversely-arrangedremovable plowshares, the inner ends of which are hinged on a rodtransversely secured on said body; a lever-controlled lifting device to5 which the front ends of such plowshares are connected and by which thesame are raised and lowered as required, and means for latching theoperating-lever in its adjusted position; and shoes on the front ends ofthe sides of the body to prevent such ends cutting into the ground,substantially as described.

4. An excavator comprising a body consisting of two sides and ascraper-back b,- a yoke or support (Z, secured on the sides; an oper- 6Oating-lever e, adjustably fulcrumed on such yoke; a rod g, havingthreaded ends and nuts 2', thereon, adjustably secured in slots It,provided in said sides, plowshares hinged by their inner ends. on saidrods 7; a brace-rod j, and 5 set-collars on said rods g and j, holdingthe plowshares against lateral motion; a yoke m suspended from the endof the lever e; a rod k, suspended by such yoke m; a draft-bar, linksconnecting the rod l", with said draft- 7 bar and with the front ends ofthe plowshares, means for lifting the lever e, in its adjusted position,and shoes on the front ends of the sides of the body to prevent suchends cutting into the ground, substantially as dcscribed.

In testimony whereof we have hereunto afiixed our signatures in thepresence of two Witnesses.

WALTER E. JACKSON. ARTHUR G. ADKINS. Witnesses:

T. J. GEIsLuR, E. D. PARROTT.

